Enable SyncManualStartAndrod feature flag

Bug: 1004264
Change-Id: Ic2164a87dc65216cae1ab0943c9a4396623232b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1805667
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697263}

components/browser_sync/browser_sync_switches.cc

@@ -23,7 +23,7 @@ const char kLocalSyncBackendDir[] = "local-sync-backend-dir";
 
 #if defined(OS_ANDROID)
 const base::Feature kSyncManualStartAndroid{"SyncManualStartAndroid",
-                                            base::FEATURE_DISABLED_BY_DEFAULT};
+                                            base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 }  // namespace switches